Heating element.



R. E. HUMBERT. HEATING ELEMENT. APPLICATION FILED JUNE 19, 1912.

1,098,35 l Paltented May 26, 1914.

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COLUMBIA PLANOURAPH Co..wAsHlNuTDN. D. c.

RICHARD E. HUMBERT, OFMILFORD, EENNSYLVANIA.

HEATING ELEMENT.

Specification of Letters Patent.

Application filed June 19, 1912. Serial No. 704,615.

T 0 all 'whom t may concern Be it known that I, RICHARD E. HUMBERT,

a citizen of the United States of America,`

and residing at Milford, in the county of Pike and State ofPennsylvania, have in-v vented a certain new and Improved HeatingElement, of which the following is a specification.

My invention relates to heating elements companying drawing, in which-Figure 1 is a vertical section through a dough raising cabinet showingmy improved heating element in position; Fig. 2 is a horizontal sectionon the line 2-2, Fig. 1; Fig. 3 is -aplan of the heating unit; Fig. 4 avertical section thereof; and Figs. 5, 6 and 7 are similar views ofmodified forms.

The heating element which forms the subject of the present invention isparticularlyl designed. for use in Clough raising cabinets such as snownin Fig. 1. In such a cabinet' A the inclosing walls 10, 11, 12, 13, 14are so joined as to render it substantially air tight during use. A door15, hung at the;

top on dowel pins 16 by means of open faced hooks 17, may be swung upand pushed back in the guide ways 18 plowedl out of the side top frames19. A glass panel 2O is preferably inserted in the door to permit visionint-o the interior. To insure a tight joint between the top of the doorand the top cross frame 21, the meeting faces are cut on a 45O bevel asindicated at 22.

The front base panel 23 is hinged on dowels at 24 so that it may beswung up to permit flour, crumbs, etc., to be readily brushed out of thebottom of the cabinet. The upper edge of this panel is rabbeted to forma joint at 25 with the lower edge of the door which is rabbeted in likemanner.

A latch 26 holds the door closed, while a combined slide pin and liftingknob 27 affords means for securing the panel 23 in its normal position.

The chamber contains as usual Va series of shelves, a, b, c, which maybe supported in any convenient manner. I have here shown the bottomshelf c supported on pins el projecting from the sides 12 andr13 at asuitable height from the, base 11. The upper shelves a, Z7, arepreferably supported upon collapsible link frames 28-28 hung from pins29-29, at the top. The pivoting rivets 30 by which the links are jointedtogether, may be made sufficiently tight to frictionally suspend theshelves (which are quite light) when the latter are raised to theposition shown in dotted lines. In this position the chamber is designedto accommodate a mixing pan or pail 31 of any well known type.Guide-ways 32 for the buttons by which the shelves are carried on the'collapsible frame, may be formed in any suitable manner on or in thesides 12 and 13.

My improved heating element is supported on the bottom 11 of thecabinet. This element preferably comprises a block 33 of refractorymaterial supported on the shoulders 34 of specially formed screw staples35 and separated from the wood of the bottom by an asbestos disk 3G. Theupper ends of the staples are again offset to form shoulders 37 uponwhich rests a second asbestos disk 38. These disks not only serve toprotect the woodwork against excessive heat, but being absorbent afforda suitable vehicle for moisture which is a desirable property for theair to possess in order to prevent the formation of a crust upon thedough while rising.

The refractory heating element may be variously formed. 1 prefer to makethe block of cement or concrete, embedding in the upper face the ends ofa heavy wire 39 which forms a handle. The recess 40 beneath the wireaifords room for the lingers. A reinforcing angle iron ring 41 may beplaced around the bottom edge of the block, as shown in Fig. 1, tostrengthen the same and to protect it from shock. If desired thereinforcement may be carried up so as to form a complete receptacle 42for the block, as shown in Fig. 4. Preferably a heat register 43 isembedded in the upper face of the vblock so that it may be ascertainedwith substantial accuracy that the stone has been brought to the desiredtemperature for use in the cabinet. When a reinforcing receptacle 42 isused, the refractory body of the heating element may be composed of sand44; in which case a disk cover 45, carrying the register 43 ispreferably used, being secured in position by rolling over the edges ofthe receptacle 42. 1n any of the forms shown a Patented May 2e, i914.

metal core 46 may be inserted which takes up Y heat more rapidly thanthe refractory material. Inasmuch however, as the core is embedded 1nrefractory material, and, in position for use, rests upon the refractoryasbes tos pad 36, its heat is retained and is givenv off but slowly.Similarly in any of the forms shown, the handle wire may be carried downand fastened to lugs 47 on the reinforcing ring or receptacle. The lugsthus serve not only as studding to unite the reinforcing ring to thecement, but also as suspension ears, by which the strain incident to thelifting of the block is transmitted tothe metal ring.

I am aware that I am not the first to place a heating element in a doughraising cabinet. But so far as I am aware, prior heating elements havebeen of differentconstruction from the present. I am also aware thatvarious devices have been proposed as plate or pot warmers for table useor the like. These have been for the most part of metallic construction,resembling stove lids or the like, as in the Jarvis Patent 213,904;while where refractory substances have been employed, they are not of aconstruction well adapted to be placed in the limited space available inthe bottom of a dough raiser. Examples of these types are found in Boeck804,184 and Rich 738,573. In the latter a refractory body is inclosed ina metallic casing, the upper face of which is anchored in the cement bya light perforated ring, through the perforations in which the cementpasses, while plastic. Such a ring could have no practical effect as aheat absorbing and radiating core such as is shown and claimed by me,and I do not pretend that my invention includes such a structure asRichs or the patents above noted disclose.

Various other modifications of my improved heating unit will readilysuggest themselves.

I claim as my invention 1. A heating element of the character de`scribed, comprising a portable block of re-r fractory material such asCement or sand and a metallic core embedded in said refractory materialand exposed at the lower face of the block whereby heat may be quicklytaken up by said core, in combination with means whereby said block maybe readily carried, substantially as described.

2. A heating element of the character described, comprising a portableblock of refractory material such as cement or sand, a metallic handlesubstantially flush with and embedded in the upper face thereof, thebody of the block being recessed below said handle to afford fingerroom, together with a solid metallic core centrally embedded in saidrefractory material, substantially as described.

3. A heating element of the character described, comprising a portableblock of refractory material such as cement or sand, a metallic handlesubstantially flush with and embedded in the upper face thereof, thebody of the block being recessed below said handle to afford fingerroom, together with a solid metallic core centrally embedded in saidrefractory material, and a peripheral metallic reinforcing ring for therefractory block, substantially as described.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses.

kRICHARD E. IIUMBERT.

Witnesses:

MABEL PAGE HUMBERT, J. C. CHAMBERLAIN.

Copies f this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C. Y

